Billy

Description
Billy is Kotaro's partner. This Revolver Gunman uses a pair of guns called RHYTHM & BLUES. A quick shooter, Billy is cool and confident.

Billy is likely named for William H. Bonney, a.k.a. Billy The Kid, a historical American frontier outlaw and folklore figure.

How to Get this Borg
"Training with Tetsuya and Kotaro" at Kou's Home is a good place to fight Billy.

The force sequence for Billy is 4, 9.